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DUAL FURNACE
FOR MODELS
M17705, M17706 & M17707
User Maintenance Manual/Handbook
Isothermal Technology Limited, Pine Grove, Southport, PR9 9AG, England
Tel: +44 (0)1704 543830 Fax: +44 (0)1704 544799 Internet: www.isotech.co.uk E-mail: info@isotech.co.uk
The company is always willing to give technical advice and assistance where appropriate. Equally, because of the programme of continual
development and improvement we reserve the right to amend or alter characteristics and design without prior notice. This publication is for
information only.
Page 1 of 40
Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14
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Summary of Contents for Isotech M17705
- Page 1 Isothermal Technology Limited, Pine Grove, Southport, PR9 9AG, England Tel: +44 (0)1704 543830 Fax: +44 (0)1704 544799 Internet: www.isotech.co.uk E-mail: info@isotech.co.uk The company is always willing to give technical advice and assistance where appropriate. Equally, because of the programme of continual development and improvement we reserve the right to amend or alter characteristics and design without prior notice.
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Page 2: Table Of Contents
FIGURE 1; SECTION THROUGH DUAL FURNACE .................... 38 FIGURE 2; SEALED METAL FREEZING POINT CELL ..................39 FIGURE 3; SEALED METAL FREEZING POINT CELL BODY DIMENSIONS ............40 Page 2 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 3: Guarantee
INTERFERENCE WITH OR FAILURE TO PROPERLY MAINTAIN THIS INSTRUMENT MAY INVALIDATE THIS GUARANTEE RECOMMENDATION The life of your ISOTECH Instrument will be prolonged if regular maintenance and cleaning to remove general dust and debris is carried out. We recommend that this instrument to be re-calibrated annually. -
Page 4: Emc Information
The Blue conductor should be connected to Neutral and the Brown conductor to Live (Line). Warning: Internal mains voltage hazard. Do not remove the panels. There are no user serviceable parts inside. Contact your nearest Isotech agent for repair. Voltage transients on the supply must not exceed 2.5kV. -
Page 5: Health And Safety Instructions
If cased, do not return the apparatus to its carrying case until the unit has cooled. There are no user serviceable parts inside. Contact your nearest Isotech agent for repair. Ensure materials, especially flammable materials are kept away from hot parts of the apparatus, to prevent fire risk. -
Page 6: Dual Furnace Certificate Of Test
Controller parameters are listed in an appendix of the manual The above Serial No. Furnace was tested as above and found to comply with the specifications. Page 6 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 7: Unpacking
Gently lift the transit clamp vertically; the attached tube and rubber securing block will thereby be extracted from the furnace core. Normal commissioning procedure may now be followed. Keep the transit clamp and use it if the furnace is ever transported. Page 7 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 8: Safety
The fuse holders will be seen at the lower right hand side of the cabinet. The black fuse holder will always contain a fuse. The white fuse holder will leave Isotech with a neutral shorting bar. As explained elsewhere, if your local supply does not have a neutral line but has both lines live with respect to earth this link should be replaced with a fuse and the holder labelled to this effect. -
Page 9: Introduction
A heat-pipe furnace to create optimal conditions for an appropriate range of fixed point cells. The use of freeze-point cells within the heat pipe is described in the manual which accompanies Isotech cells. All 4 features are built into one cabinet, making the dual furnace a self-contained calibration facility. -
Page 10: The 3 Dual Furnaces
Contains a sodium heat pipe with a temperature range from 450°C to 1100°C, thus constituting a facility for Aluminium, Silver, Gold and Copper freeze point measurements. Its annealing furnace has a temperature range from near ambient to 950°C. Page 10 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 11: Operational Convenience
The two furnaces in each dual furnace have independent temperature controllers and independent adjustable over- temperature cut-outs for added security. These features are shown in the wiring diagram. Page 11 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 12: Acknowledgement
ACKNOWLEDGEMENT The Isotech dual furnace owes its origin to Dr. P. Marcarino of Italy. His research and development solved many of the problems of contamination and handling of high temperature thermometers. Page 12 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 13: Commissioning
The remainder of the instructions differ for the three models; reference should be made to the page clearly marked with the appropriate dual furnace model. Page 13 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 14: Model 17707 Water Heat-Pipe Furnace
Allow 1 to 2 hours for the furnace to stabilise and then reduce the over-temperature cut-out setting until the relay trips, thus switching off the furnace. The 17707 furnace is now ready for use. Page 14 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 15: Next Generation Calibration Apparatus For Indium And Tin Fixed Points
The annealing temperature varies typically between 400 and 700°C. DESCRIPTION The new calibration apparatus developed by Isotech not only allows you to create and maintain the ITS 90 freezing points of Indium and Tin using a water heat-pipe, but also provides a second furnace for annealing thermometers at temperatures up to 700°C. -
Page 16: Specification
3D oxides. A comprehensive manual accompanies each apparatus. Reproducibility of the temperatures of freezing indium or tin is typically ±0.1mK with Isotech fixed point cells. HOW TO ORDER Ask for Model 17707. We need to know your voltage and whether you require communications. A temperature equalising block is an available option (for comparison calibration purposes). -
Page 17: The Potassium Heat-Pipe Furnace, Model 17706
Run the water for 1 hour to check the furnace for absence of leaks (the floor underneath the cabinet should be inspected). The 17706 furnace is now ready for use. Page 17 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 18: Next Generation Calibration Apparatus For Zinc, Aluminium And Silver Fixed Points
DESCRIPTION Sufficient information now exists at Isotech to allow introduction of a new apparatus, specifically designed not only to realise and maintain the ITS 90 fixed points of Zinc, Aluminium and Silver, but also to pre- and post-condition the thermometers to be calibrated. -
Page 19: Specification
The addition of the second furnace, with its air-flow, enables thermometers to be easily and safely calibrated. A comprehensive manual accompanies each delivery. Page 19 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 20: The Sodium Heat-Pipe Furnace, Model 17705
The sodium heat-pipe incorporated in Model 17705 has a life of about 1000 hours at 1100°C, limited by the Inconel containment. It should endure operation for at least 10,000 hours at 1000°C. Page 20 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 21: Next Generation Calibration Apparatus For Aluminium, Silver And Copper Fixed Points
DESCRIPTION Sufficient information now exists at Isotech to allow introduction of a new apparatus, specifically designed not only to realise and maintain the ITS 90 fixed points of Aluminium, Silver and Copper, but (housed in the same facility) incorporating a second furnace which, because of its design, can be used safely and without contamination, to pre- heat and anneal the thermometers for calibration. -
Page 22: Specification
The addition of the second furnace with its air-flow enables thermometers to be easily and safely calibrated. A comprehensive manual accompanies each delivery. Page 22 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 23: Eliminating Contamination During The Calibration Of High Temperature Thermometers23
0.5mK equivalent. Instructions in the Isotech 962 and 96178 thermometer manuals explain how to handle and keep clean the thermometers. It is imperative that procedures are followed because contaminants can penetrate and pass through physically-intact quartz sheaths at temperatures above 800°C. - Page 24 IMPORTANT NOTE: Since the calibration of sensors at high temperatures can be fraught with difficulties, if any doubt exists, please consult Isotech for advice before embarking on any exercise in which there is a risk of contamination of the sensors you are trying to calibrate.
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Page 25: Maintenance
Therefore, we now prefer to work differently. With international communications so good these days, if anything goes wrong with the apparatus or you need any other after sales service, just contact Isotech or the agent from whom you purchased the apparatus. On our help-line we are anxious to serve you and will swiftly be able to help you solve your problem, or deal with a technical enquiry. -
Page 26: Spare Parts
110V Rocker Switch 935-27-02B N Thermocouple 935-14-42 White Fuse Holder 935-11-10 Inconel Cell Basket 410-03-00A Ceramic Bricks 935-29-02 Silicon Carbide Tube (Sodium/Potassium) 935-29-20 Pre-heat Tube (Water) 420-03-22 Page 26 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 27: Cell Handling
CELL HANDLING In order to facilitate introduction to, and removal from the furnace, Isotech can provide for each cell, supplementary equipment largely comprising an Inconel basket with detachable handle. To prevent the cell-surface becoming discoloured, it is recommended that, before using the cell, the basket and insulation be placed in the furnace and the furnace be taken to above the cell working temperature for at least 2 hours. - Page 28 Page 28 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14...
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Page 31: Thermometric Fixed Points; A Tutorial
This melt plateau can last for a considerable period of time. When melting is complete, the cell temperature will rise to the furnace temperature. Page 31 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... - Page 32 1 standard atmosphere pressure, for the various metals (and for mercury and water at their triple points), are given in the table. For a given column height (of the order of 200mm for Isotech sealed freeze point cells), the correction will be proportional to metal density and to a coefficient expressing the sensitivity to pressure of the phase-change temperature.
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Page 33: Defining Fixed Points And Related Data
Furnace with potassium heat-pipe for zinc freezing point. Furnace with either potassium or sodium heat-pipe at aluminium and silver freezing points. Page 33 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 34: General Note On Isotech Metal Freeze Point Cells
GENERAL NOTE ON ISOTECH METAL FREEZE POINT CELLS Isotech freeze point cells contain metal that is 99.9999+% pure, except that aluminium cells may be filled with metal not less than 99.999% pure, depending upon the availability of aluminium in suitable physical form. -
Page 35: Precautions To Prevent Devitrification Of Quartz Envelopes
PRECAUTIONS TO PREVENT DEVITRIFICATION OF QUARTZ ENVELOPES The crucibles (containing the metal) of Isotech sealed fixed point cells are encased in an envelope of pure fused quartz, whose purpose is to avoid contamination of the enclosed metal, by foreign metal ions or oxygen. To this end, it contains an inert gas whose pressure is 1 standard atmosphere at the metal freezing temperature. -
Page 36: General Comment
(as a system) to ensure that the melt is clearly identifiable and sufficiently consistent. Page 36 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 37: Additional Services And Information
ADDITIONAL SERVICES AND INFORMATION Isotech operates one of the world's most comprehensive UKAS supervised Laboratories. Training is available to customers at an agreed daily rate. The Isothermal Journal of Thermometry is a must for all Laboratory Managers and is on subscription. -
Page 38: Figure 1; Section Through Dual Furnace
FIGURE 1; SECTION THROUGH DUAL FURNACE Page 38 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 39: Figure 2; Sealed Metal Freezing Point Cell
High-purity graphite crucible and cover High-purity graphite sleeve High-purity metal Fused-quartz envelope, filled to give a pressure of 1 standard atmosphere at the metal freezing temperature. Page 39 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14... -
Page 40: Figure 3; Sealed Metal Freezing Point Cell Body Dimensions
FIGURE 3; SEALED METAL FREEZING POINT CELL BODY DIMENSIONS Page 40 of 40 Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14...
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